Improvement in eeodlating-deyioe of millstones



S. BENSON.

BBGULATING DEVICE FOR'MILLSTONES.' No. 79,528. Patented June 30, 1868-.

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SAMUEL BENSON, OF OENTRALIA, ILLINOIS, ASSIGNOR'TO HIMSELF, JAMESBENSON, AND JOHN F. BENSON, OF THE SAME PLACE.

Letters Patent No. 79,528, dated June 30, 1868.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, SAMUEL BENSON, of Gentralia, in the county ofMarion, and State of Illinois, have invented a new and usefulImprovement in Springs for Regulating the Motion of Millstones; and I dohereby, declarethat the following is 'a full, clear, and exactdescriptionthereof, which will enable others skilled in the 'a'rt tomake and use' the same, reference being had'to the accompanyingdrawings, forming part oi this specification, in which- A Figure 1 is acentral vertical section of a rnill-spindle,with tny improvedcompensating-springs and trundle=- head attached. v I

' Figurati e, horizontal sectionof the springstakn in the line a: :e,fig. 1.

Similar letters of reference indicate like parts. I

The object of this invention is to provide the means of perfectlycompensating for the check of'the engine while'passing dead-centres, andequalizing the motion of millstonos. This object is accomplished bymeans of spiralsprin'gs enclosed in disks, or a circular-case set uponthe mill-spindle iiiconnection with the trundle-head, in such mannerthat the springs-are contracted by the'action of the inotive-power whenite'i'erts its greatest force in themore rapid part of the revolutionsof the driving-shaft, and are retracted or expanded when the enginepasses the dead-centres, and slacks the speed of the driving-shaft, thusapplying the accumulated force of thecontraeted springs to -thepropulsion of the spindle, to compensate for the loss of powe'r andmotion directly imparted by-the engine, thereby effectually preventingthe backlash of the machinery, and equalizing and steadyiug the moti onof the'spindlo and runner attached to it, as hereinaftervmoreparticularly described.

,Atrepre'sents a mill-spindle, on the lower end of which is keyed fast abush or sleeve, B, which supports the trundle-head C,1that is looselyhung upon it. i Above the trundle-head the lower section, of a disk orspring-case, is hung looselyupon the spindle A, the underside of thediskesection 'D being provided with lugs, a a, that set within the webof the trundle-head, and catch upon the arms or spokes 1b of the wheel,foi the purpose of carrying the spindle by means of the upper section ofthe case D, which is rigidly keyed or otherwise fastened to the spindle,and is also secured .to the lower section 1) by means-of bolts in therims or peripheries of the disks, which pass through slots in one of thesections, to allow them a limited reciprocating movement for the actionof contraction and esipam sicnin the spiral springs E E, containedwithin the disks or ease as hereinafter described. v

I lhe springsjE E nre'formed in sections or segments, coiled spirally tofit in a circular hollowspace formed hycqual concentric grooves in theupper-and lower parts of the case, and facing each'other when thesections '1) and D are united.

The circular groove in the lower section D is. di'yided into two equalparts by partitions, c c, in ade fast and placed opposite each other,"projecting so as to enter the groove in the section D, and the circulargroove in the upper section D is'also'divided in. the same mannerby-partiti'ons c 0', also made fast in it,'and projecting into thegroove in D. v

When the upper and lower disks are put together, with their partitionsset equally apart, the hollow space formed by the circular grooves inthenfis divided into four compartments, within which the spiral springsE E are laid, t

When the springs arein this: position'it will l e-seen that they may becontracted by the bearing of the' partitions in the grooves, acting asabutments against their ends when one of the disks is rotated, while theother-is held fast, and consequently, that when 'the force whichcontracts the'springs relaxes, they will expand,

and exert a-counteracting force. By this means they willoperate upon-thespindle to conipensate for the loss of speed and power when the enginepasses herdead-cen t'res, and thus equalize the motion otfthe spindleand the millstone hung ppon it.

' The upper section '1) is made fnstto the spindle A, while the lowersection-D is loose on the spindle, and the trundle-heed O is also looseupon the sleeve B, but when the trundle-heed is turned, its arms engagethe lugs a a on the lower section D, and thus turn it until'the springsE Em-e contracted, and it engages the ripper section D by means of boltsin the rim, end rotates the spindle A,- to which the upper section D ismade fast. The eccumulatedpomver of the contracted springs reactswhen-the pressure upon them relaxes, and thus a compensating' powerisapplied to the spindle to equalize the motion.

Having described my invention, I claim as new, and desire to secure byLetters Patent 7 The combination of the springs E E, the disk-sections DD, thevpinion'G; and the spindle A, arranged and operating substantiallyas and for the purpose herein described.

SAMUEL BENSON.

Witnesses:

J. O. GUNN, J. P. Wmson.

